diff --git a/action.yml b/action.yml
index ae542ec..e3c797b 100644
--- a/action.yml
+++ b/action.yml
@@ -20,9 +20,9 @@ inputs:
     required: false
     default: "."
   extensions:
-    description: Space separated list of extenions. Only changed files with these extensions will be passed to ESlint.
+    description: A comma separated list of extensions to run ESLint on.
     required: false
-    default: ".js .ts .jsx .tsx .mjs .cjs"
+    default: ".js,.ts,.jsx,.tsx,.mjs,.cjs"
 outputs:
   warning-count:
     description: "Number of relevant warnings found"
diff --git a/dist/index.js b/dist/index.js
index 5fd4316..855c49e 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -26363,7 +26363,7 @@ async function run() {
         changedFiles = await (0, git_utils_1.detectChangedFiles)(compareSha);
     }
     core.debug(`Changed files: ${changedFiles}`);
-    let extensions = core.getInput("extensions").split(" ");
+    let extensions = core.getInput("extensions").split(",");
     core.debug(`Extensions: ${extensions}`);
     let changedFilesMatchingExtensions = changedFiles.filter((file) => extensions.some((ext) => file.endsWith(ext)));
     core.debug(`Changed files matching extensions: ${changedFilesMatchingExtensions}`);
diff --git a/src/index.ts b/src/index.ts
index fdee099..600e5bc 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -34,7 +34,7 @@ async function run() {
 
   core.debug(`Changed files: ${changedFiles}`)
 
-  let extensions = core.getInput("extensions").split(" ")
+  let extensions = core.getInput("extensions").split(",")
   core.debug(`Extensions: ${extensions}`)
   let changedFilesMatchingExtensions = changedFiles.filter((file) =>
     extensions.some((ext) => file.endsWith(ext)),